WOODWARD 1751-6058 is a 4-channel isolated transformer module specially designed by Woodward for signal processing of magnetic pickup speed sensors (MPU).It is used to provide electrical isolation, voltage clamping and signal conditioning for raw MPU speed signals from rotating equipment such as gas turbines, steam turbines and engines.Compatible with Woodward control systems including TPM (Turbine Protection Monitoring), it solves problems of strong on-site interference, overvoltage and ground loop currents, ensuring reliable speed measurement and overspeed protection.
Positioning & Application
Designed specifically for the Woodward TPM system (Manual 35027) and used with the NI 9221 speed input module.Solves on-site issues of high voltage, common-mode interference, and grounding problems from MPU signals, protecting the backend control modules from breakdown.Provides 4 independent channels to simultaneously process dual redundant MPU signals for Gas Generator (GG) and Power Turbine (PT).Used in critical safety loops such as overspeed protection, speed monitoring, and MPU fault detection.
Core Functions
Electrical Isolation
Full isolation between channels and between input and output, eliminating ground loops and suppressing common-mode interference, suitable for harsh industrial electromagnetic environments.
Voltage Clamping & Protection
Limits the induced voltage from MPU that may exceed limits at high speeds to the safe input range (±60V) of the NI 9221, preventing module damage.
Signal Matching & Conditioning
Maintains fidelity of speed pulse frequency and phase, providing clean and stable square-wave / sine-wave speed signals to the backend control system.
4-Channel Independent Operation
Supports two redundant MPU channels each for GG and PT; a single channel fault does not affect other channels, meeting redundancy protection requirements.
Passive Operation
No external power supply required; driven directly by MPU induced signals, enabling simple installation and high reliability.
Technical Parameters
- Model: 1751-6058
- Number of Channels: 4 independent channels
- Compatible Sensors: Magnetic Pickup Unit (MPU) speed sensors
- Turns Ratio: 1:1 (standard version)
- Input Frequency: 0–10 kHz (matches maximum processing frequency of TPM)
- Isolation Voltage Rating: Meets industrial control-grade withstand voltage
- Compatible Systems: Woodward TPM, ProTech, cRIO-9068 control systems
- Mounting: DIN rail / panel mounting, suitable for TPM chassis layout
- Wire Gauge: 12–24 AWG copper conductors
- Operating Environment: -40℃ to +70℃, compliant with IEC 60068
Product Advantages
- Safety & Compliance: Meets ATEX, IECEx, CE and other explosion-proof and EMC requirements, suitable for Zone 2 hazardous areas.
- High Reliability: Passive design with no component wear, vibration and shock resistant, ideal for long-term continuous operation of turbines.
- Plug-and-Play: Directly compatible with Woodward standard speed module NI 9221, no additional configuration required.
- Redundancy-Friendly: 4-channel design perfectly supports GG/PT dual redundant MPU architecture, improving availability of the protection system.
- Genuine Quality: Original Woodward spare part, fully compatible with TPM system hardware and software, no compatibility risks.
Typical Application Scenarios
- Overspeed protection systems for gas turbines / steam turbines
- Speed monitoring and safety shutdown for engines / compressor units
- GG/PT dual redundant MPU signal isolation for power generation equipment
Reliable speed acquisition for industrial rotating machinery in highly interfered environments
Frequently Asked Questions (FAQ)
Q1: What is the difference between 1751-6058 and 1751-147?A1: Both are MPU isolation transformers. 1751-6058 has a 1:1 turns ratio, while 1751-147 has a 3:1 ratio. The former is used for applications with moderate signal amplitude; the latter is used where MPU output voltage is high and significant voltage reduction is required. Both are compatible with the NI 9221 module.
Q2: Do I have to connect 4 MPUs? Can I use only 2 channels?A2: The 4 channels are independent; any 1 to 4 channels can be used. Unused channels can be left floating without affecting normal operation of other channels.
Q3: Does this module require power supply?A3: It is a passive module and requires no external power supply; it is fully driven by the induced electromotive force from the MPU.
Q4: Why is this module necessary for the TPM system?A4: At high speeds, the MPU generates induced voltage far exceeding ±60V, which would damage the NI 9221 if connected directly. This module provides isolation and voltage clamping, making it an essential hardware safety component.
Q5: What should be noted during wiring?A5:
- Connect the two terminals of each MPU to the corresponding module inputs, and the two output terminals to the corresponding channels of NI 9221.
- Ground the shield at one end only to avoid ground loops.
- Clearly distinguish GG/PT and main/backup MPUs to prevent wiring errors that cause abnormal protection logic.
Q6: How to determine if the module is faulty?A6:
- No speed display, large fluctuations, or MPU fault alarms on a channel.
- Replacement test: switch a working MPU to this channel; if the problem persists, the module is faulty.
- Check input and output amplitude; a normal passive transformer shows no significant attenuation and no short or open circuit.
Q7: Can it be used in non-Woodward systems?A7: Yes, it can be used in any control system with MPU magnetic speed signals that require isolation / voltage clamping and have a frequency ≤ 10 kHz.
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Woodward 1751 Series models are all designed for signal conditioning and isolation of magnetic pickup unit (MPU) speed sensors, suitable for safety loops of rotating machinery such as turbines and engines.
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